MT-32 Montana Grazing Animal Unit Month (AUM)/Acre Estimator
Range and Pasture Technical Note Number MT-32 (Revision 2)
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Rangeland and dryland pasture Animal Unit Month (AUM) estimations are needed for a variety of conservation planning and data applications.
Anticipated Use of the AUM Estimator
Montana Department of Revenue - Application for Agricultural Classification of Lands. AUM calculations must use the Below Normal AUM/Acre values for qualifying agricultural land.
Definition of AUM/Acre Parameters
Below Normal AUM/Acre values – lower precipitation and possibly cooler temperatures at a critical time that leads to lower production for the historic climax or near climax plant community. These AUM/Acre values should be used for AUM estimation where the plant community is at less than the historic climax or near climax condition or similarity index.
Normal AUM/Acre values – precipitation and temperature that allows for normal plant production for the historic climax or near climax plant community.
Above Normal AUM/Acre values – higher than normal precipitation as well as adequate temperatures that allows higher plant production for the historic climax or near climax plant community.
If you have any questions, please contact:
Jon Siddoway, Rangeland Management Specialist
Phone: (406) 587-6790